So model



PATENTED FEB. 16, 19 04r E. 0. HENDERSON.

STITCH FORMING MEGHANISM.

APPLICATION FILED DEG. 23, 1902. N0 MODEL. 2 SEEETS-SHEET 1.

INVENTOH WJTNESSES." W1 Zin /z fi fizdwzmn I v BY 2 A TTORNE Y8.

N9. 752,451. PATENTED FEB; 16,1904. E. 0. HENDERSON.

STITCH FORMING MECHANISM.

APPLIUATIQN FILED DEG. 23 1902.

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No. 752,451. 7 Patented February 16, 1904.

UN TED STATES, PATENT OFFICE.

' EWEN. C. HENDERSON, OF PICTOU, CANADA, ASSIGNOR OF THREE-FOURTHS TO JOHN MONROE, EDWARD CARSON, ALVAN J. CRAIG, AND JOHN SMITH GRANT, OF PICTOU, NOVA SCOTIA, CANADA.

STITCH-FORMING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 752,451, dated February 16, 1904.

Application filed December 23, 1902. Serial No. 136,319. (No modeL) T all VII/71107711 it y con/Per": which may be of the usual or any preferred Be it known that I, Ewan C. HENDERSON, form. 1 50 a subject of the King of Great Britain, and a In Figs. 1 to A the hook (Z is shown to be resident of Pictou, in the Province of Nova of the usual rotary type driven from a shaft 5 Scotia, Dominion of Canada, have invented a h, on which it is carried.

new and Improved Stitch-Forming Mechan- 91 indicates the needle-plate of the machine, ism, of which the following is a full, clear, and may be taken to represent the fabric '55 and exact description. being stitched.

The object of this invention is to provide a In the operation of the apparatus the needle stitch-forming mechanism for sewing madescends and projects a loop of the thread 6 chines by means of which a lock-stitch. may below the needle-plate. The hook d in rotabe formed without the use of a shuttle and its ting throws its bill through this loop of the 60 appurtenant parts. 7 needle-plate, and the thread-guide arm 0 as- To this end the mechanism comprises a sumes the position shown in. Fig. 2, so that needle carrying the needle-thread as usual, a the bill of the hook 03 carries the lower or lock guide adapted to carry a second thread to thread 6 and draws a loop thereof through complete the formation of the lock-stitch, and the loop of the needle-thread. The needle 5 a hook or other means for drawing the thread now ascends, and concurrent with this action from the guide, these elements being conthe loop of the needle-thread is drawn up structed and arranged in a certain novel tightly against the fabric, as in the usual manner, as will hereinafter fully appear. manner. Fig. 2 shows the bill of the hook (Z This specification is an exact description of entering through the loop in the needle-thread, 7 two examples of my invention, while the and Fig. 3 shows the needle raised and the claim defines the actual scope thereof. hook cZ continuing its rotary movement. As Reference is to be had to the accompanying the hook reaches the position shown in Fig. drawings, forming apart of this specification, 4, the above-described loop of the lower or in which similar characters of reference indilock thread 6 assumes the position there illus- 75 cate corresponding parts in all the views. tratedthat is to say, it lies slack over the Figure l is a side elevation of the mechanbill of the rotary hook. The bill of this hook 3 ism. Figs. 2, 3, and 4 are front views showthen again passes the guide-arm c and forms a ing the needle, the rotary hook, and the second loop in the lock-thread 6. Meanwhile thread-guide in different positions and illus the needle will have returned to its lower po- 80 trating the formation of the stitch. Figs. 5, sition and brought down a second loop in the 6, and 7 are views illustrating a modification needle-thread. The hook (i then draws the in which a reciprocating hook and cast-off are second-named loop of the lock-thread through employed to produce the same result; and the loop of the needle-thread and also through Fig. Sis a vertical section of a sewing-mathe first-named loop of the lock-thread. It 5 chine, showingall of the parts concerned with will therefore be seen that the first-named my'invention. loop of the needle-thread is locked by the 40 Referring to Figs. 1 to 4:, a indicates thev first-named .loop of the lock-thread and that needle-bar carrying the needle a, and Z) indithis first-named loop of the lock-thread is in cates the needle thread. 0 indicates the turn locked by a second loop formed in the 9 thread-guide, which is here illustrated in the lock-thread. This second loop of the lockform of a rocking arm perforated to permit thread is then drawn through the secondloop the lower thread to be passed through it. in the needle thread to lock said second This lower thread is indicated at e in the loop, and a third loop is drawn from the lockdrawings. f indicates a tension device for thread to lock the second loop of the lockthe lower thread, and 9 indicates a take-up, thread and also to lock the third loop of the thelock-thread as above described is not ma.-

needle-thread. Thus the stitch progresses throughout the action of the machine.

The precise form of the means for drawing the application of this oscillating hook for the purpose in hand.

The needle-thread guide and hook are geared by suitable means to operate in the time or order above described. Fig. 8 shows an example of the various mechanisms which may be employed for this purpose.

Referring to Fig. 8, 10' indicates the table of the machine, and 11 the arm. 12 indicates the drive-shaft, having a cam-disk 14: attached thereto. Said cam-disk operatesthe take-up arm 15 and by means of a link 16 the needlebar 17. 18 indicates a tension device coacti-ng with the take up 15 vto carry the needlethread 6. Under the table 10 a rotary shaft 19 is arranged, this shaft being driven from the shaft 12 by means of a connecting-rod 20 and cranks 21. Said shaft 19- carries a cam 22, operating a sliding take-up 23-, which coacts with a tension device 26L to control the lock-thread e. 25 indicates the sliding. hook, having a latch 26 mountedthereon, these parts 25 and 26 being essentially the same as the elements d and Z in Figs. 5', 6, and 7., Said the above-mentioned shaft 19. A crank pin or screw 28 is carried by the end of the shaft 19, and this operates the oscillating threadguide 29, which performs the functions of the element 0 in Figs. 2 to 7 Said thread-guide is formed at its lower end with a slot 30, receiving a pin 31', carriediby an arm 82, forming part of the framing of the machine. By giving the above-described parts the proper relative arrangement the needle-bar, the hook, :and the thread-guide may be caused to work mthe proper time or order, so as to attain the results described hereinbefore.

Having thus described my invention, I claim as new and desire-to secure by Letters Patent 'A stitch-forming mechanism, comprising the combination with a framing or support, of aneedle adapted'to carry the needle-thread, means for reciprocally driving the needle, a thread-guide adapted to carry a lock-thread, a looper-hook, means for moving the threadguide toward-and from thepathof the looperhook, and means for operating the looperhook, the said operating means .of the needle, thread-guide and looper-hook being in conneotion with each. other so as-tooperate in unison and to-cause: thehook to draw a loop of the lock-threadzthrough a loopin theneedlethread and subsequently to release said: loop of the-lock-thread and draw a second loop of the lock-thread through av second loopin the needle-thread and through the first loop of the lock-thread.

Intestimony whereofI have signed my-name to this specification in the presence of two subscribing. witnesses.

- EWEN C. HENDERSON.

Witnesses:

sliding hook 25 is operated by a cam. 27. on

THo As MEAGHER, D. FRASER. 

